ignore the R installation part on travis knitting on travis would always be too time consuming and would always be done locally anyway to preview results
ignore the R installation part on travis
knitting on travis would always be too time consuming and would always be done locally anyway
to preview results

cboettig/2011,cboettig/2011,cboettig/2011,cboettig/2011,cboettig/2011,cboettig/2011